Continuity mistake: When Niles and Roz are talking at the cabin, in some shots her sleeve is pushed up her arm and in some it is down to her wrist, with no time for her to change it.
Continuity mistake: As part of his divorce settlement from Maris, Niles gains ownership of Shady Glen, Maris' mountain home. After this episode, Shady Glen is never seen or mentioned again. What's even odder is that Niles and the rest of the characters over the years go to mountain cabins, which makes no sense because wouldn't they just use Niles' place?
Continuity mistake: Early in the show Niles and Daphne are in the kitchen talking while Daphne makes tea. She puts the lid on the teapot and in the next shot the lid is on the counter again.
Continuity mistake: The nutcracker in the bowl next to Frasier's elbow changes position several times while they are trying to convince Marty to change the date of his poker game. (00:11:00)
Continuity mistake: Late in the show, Frasier throws his notebook on the coffee table and it lies flat near the books. A couple of shots later, it is on top of one of the books, with pages flipped back. No one went near it in the meantime.
Continuity mistake: During the scene where Daphne is upset because there's a spot on her dress, Roz is standing with her arms by her sides - then in a quick shot change, her arms and hands are up in front of her, holding her purse and wrap.
Continuity mistake: At the start of the show Niles is playing the piano. He turns to talk to Frasier and his hands are in his lap, but in the next shot one hand is back up on the piano keys, with no time for this to have happened naturally.
Continuity mistake: Niles leaves the kitchen with a small tray of devilled eggs to serve his guests - as the shot changes to him coming into the dining area, he is carrying a different tray, with different appetizers on it, including some grapes. (00:08:35)
Continuity mistake: Frasier discovers Niles' bird is dead and throws a dish towel over it. The next shot of the dish towel shows it has changed position, and the third shot shows it back in its original state. No one touched it in the meantime. (00:10:10)
Continuity mistake: During the part of the show where they are getting ready to play Murder we can see empty punch glasses on the table - in another shot we see three even though no one went near them. This changes back to 2 after the lights come on - unlikely anyone helped themselves to punch when the lights were out.
Continuity mistake: Kenny enters the booth, and Dr. Nora's purse is on the edge of the desk. Immediately in the next shot it's gone. Then it's back. When Kenny leaves it's gone again. (00:10:25)
Continuity mistake: Near the end of the show, Niles and Frasier are shaping hamburger patties in the kitchen. Niles has a blue bottle of water which sits on the stove top in front of him. In one shot it suddenly appears on the counter to his right; even though Niles hadn't moved it. By the end of the scene it is back in front of him on the stove top.
Continuity mistake: Near the start of the show, Roz arrives at Frasier's with baby Alice. She is standing near the balcony door in her black gown when suddenly a white spit-up cloth appears on her shoulder that had not been there previously in the scene.
Continuity mistake: When Frasier and Niles are in the restaurant, Niles is under the influence of medication. He lays his head down on his arm just as one of the geniuses arrives and greets them. In the next shot, his head is lying right on the table, with no time for him to have switched positions.
Continuity mistake: When Dr. Nora's mother comes into Nora's booth, she locks both doors so Frasier can't get in. However, Nora gets upset, quickly gets up and opens the door, without having to unlock it.
Answer: It equals the record of James Arness of "Gunsmoke" for the actor who's played the same part on TV NOT in a soap opera. If you include soaps there are two main contenders - William Roache, who's been playing Ken Barlow in "Coronation Street" in the UK since 1960. Don Hastings has been playing Robert Hughes in US soap "As the World Turns" since 1960 as well.